BUG #18108: server process was terminated by signal 11: Segmentation fault

The following bug has been logged on the website:

Bug reference:      18108
Logged by:          xianglinsao1
Email address:      liuqi7850@126.com
PostgreSQL version: 15.2
Operating system:   redhat 7.9
Description:

Recently I executed a merge SQL with over 1.5W rows inside PG15.2, which
caused the database to report a crash error and then terminated all database
sessions，but changing the merge to insert syntax worked fine, I'm trying to
understand where this is and if I need to change the settings.
Below are the DB and OS logs(ID or address data was changed to unreal):

OS LOG：
       Sep 14 09:35:29 localhost kernel: postgres[155588]: segfault at
1857ffc ip 00008afe187b4716 sp 0000fdh87ab9818 error 4 in
libc-2.17.so[7efe1dsf65e000+1c4000]
       Sep 14 09:35:29 localhost abrt-hook-ccpp: Process 155588 (postgres)
of user 1000 killed by SIGSEGV - dumping core
       Sep 14 09:35:37 localhost abrt-server: Package 'postgresql15-server'
isn't signed with proper key
       Sep 14 09:35:37 localhost abrt-server: 'post-create' on
'/xxxxxx/ccpp-2023-09-14-09:35:29-145588' exited with 1
       Sep 14 09:35:37 localhost abrt-server: Deleting problem directory
'/var/spool/abrt/ccpp-2023-09-14-09:35:29-144588'

DB LOG：
       2023-09-14 09:35:37.490 CST [155588] LOG:  server process (PID
155588) was terminated by signal 11: Segmentation fault
       2023-09-14 09:35:37.490 CST [155588] DETAIL:  Failed process was
running: merge into XXXX d using( ******* ) s
              WHEN NOT MATCHED THEN INSERT （********） VALUES (*******)
              WHEN MATCHED AND (******) THEN UPDATE SET *******
       2023-09-14 09:35:37.490 CST [155588] LOG:  terminating any other
active server processes
       2023-09-14 09:35:37.540 CST [155588] LOG:  connection received:
host=xxxxxxxx port=xxxx
       2023-09-14 09:35:37.541 CST [155588] FATAL:  the database system is
in recovery mode